Bedienungsanleitung Kenwood DRV-830 (Seite 48 von 49) (Deutsch)

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Wichtiger Hinweis zur Software

MD5 utility

/* crypto/md5/md5.h */

This package is an SSL implementation written

by Eric Young (eay@cryptsoft.com).

The implementation was written so as to conform

with Netscape's SSL.

This library is free for commercial and non-com-

mercial use as long as the following conditions are

adhered to. The following conditions apply to all

code found in this distribution, be it the RC4, RSA,

lhash, DES, etc., code; not just the SSL code. The SSL

documentation included with this distribution is

covered by the same copyright terms except that

the holder is Tim Hudson (tjh@cryptsoft.com).

any Copyright notices in the code are not to be

removed.

If this package is used in a product, Eric Young

should be given attribution as the author of the

parts of the library used.

This can be in the form of a textual message at

program startup or in documentation (online or

textual) provided with the package.

Redistribution and use in source and binary forms,

with or without modiﬁcation, are permitted provid-

ed that the following conditions are met:

1. Redistributions of source code must retain the

following disclaimer.

2. Redistributions in binary form must reproduce

the above copyright notice, this list of conditions

and the following disclaimer in the documen-

tation and/or other materials provided with the

distribution.

3. All advertising materials mentioning features or

use of this software must display the following

acknowledgement:

“This product includes cryptographic software

written by Eric Young (eay@cryptsoft.com)”

The word ‘cryptographic’ can be left out if the

routines from the library being used are not

cryptographic related :-).

4. If you include any Windows speciﬁc code (or

a derivative thereof) from the apps directo-

ry (application code) you must include an

acknowledgement:

“This product includes software written by Tim

Hudson (tjh@cryptsoft.com)”

THIS SOFTWARE IS PROVIDED BY ERIC YOUNG “AS

IS” AND ANY EXPRESS OR IMPLIED WARRANTIES,

INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WAR-

RANTIES OF MERCHANTABILITY AND FITNESS FOR

A P

ARTICULAR PURPOSE ARE DISCLAIMED. IN NO

EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE

LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-

CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

(INCL

UDING, BUT NOT LIMITED TO, PROCUREMENT

OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

HOWEVER CAUSED AND ON ANY THEORY OF LIA-

BILITY, WHETHER IN CONTRACT, STRICT LIABILITY,

OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

ARISING IN ANY WAY OUT OF THE USE OF THIS

SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY

OF SUCH DAMAGE.

The license and distribution terms for any publicly

available version or derivative of this code cannot

be changed. i.e. this code cannot simply be copied

and put under another distribution license [includ-

ing the GNU Public License].

---------------------------------------------------------------------

CRC utility

this program, or code or tables extracted from it, as

desired without restriction.

First, the polynomial itself and its table of feedback

terms. The polynomial is X^32+X^26+X^23+

X^22+X^16+X^12+X^11+X^10+X^8+X^7+

X^5+X^4+X^2+X^1+X^0

Note that we take it “backwards” and put the

highest-order term in the lowest-order bit. The

X^32 term is “implied”; the LSB is the X^31 term,

etc. The X^0 term (usually shown as “+1”) results in

the MSB being 1.

Note that the usual hardware shift register imple-

mentation, which is what we're using (we're merely

optimizing it b

y doing eight-bit chunks at a time)

shifts bits into the lowest-order term. In our imple

mentation, that means shifting towards the right.

y do we do it this way? Because the calculated

CRC must be transmitted in order from highest-order

term to lowest-order term. UARTs transmit characters

in order from LSB to MSB. By storing the CRC this way

we hand it to the UART in the order low-byte to high-

byte; the UART sends each low-bit to high-bit; and

the result is transmission bit by bit from highest- to

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